LernaeaLer*n[ae]"a\ (l[~e]r*n[=e]"[.a]), n. [NL., fr. L. Lernaeus Lern[ae]an, fr. Lerna, Gr. Le`rnh, a forest and marsh near Argos, the mythological abode of the hydra.] (Zo["o]l.) A Linn[ae]an genus of parasitic Entomostraca, -- the same as the family Lern[ae]id[ae]. Note: The genus is restricted by modern zo["o]logists to a limited number of species similar to Lern[ae]a branchialis found on the gills of the cod.